Final answer:
Sterilization is the classification of disinfection used to kill all bacteria, viruses, and fungi.
Step-by-step explanation:
The classification of disinfection used to kill all bacteria, viruses, and fungi is sterilization. Sterilization is the most extreme protocol for microbial control and aims to completely remove or kill all microbes and viruses, including endospores, from the target item or environment. Sterilants, which are chemicals that can achieve sterilization, effectively kill all microorganisms and viruses, including endospores.